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Would 4GB + 2GB DDR3 work in dual channel?

post #1 of 12
Thread Starter 
Title asked it all.
Everything else are identical.
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post #2 of 12
Not that I am aware. You need identical sticks for dual/triple/quad channel ideally, or at least the same capacity AFAIK.
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post #3 of 12
It is more likely that some of the larger stick won't be used...

IMHO

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post #4 of 12
Are you talking about having 2x4gb and 2x2gb sticks (total of 4 sticks for 12 total gigs?) every mobo manual I've read recently says that it STRONGLY recommends having all 4 the same if your gonna populate all 4 slots. (though intel states that by placing the 4gb sticks in channel 1 slot 0 and channel 2 slot 0 while placing the 8gb sticks in channel 1 slot 1 and channel 2 slot 1 you will keep a dual channel configuration.

or are you asking if you can put 2 different ram sizes in and have it run in dual chan the short answer is NO

the long answer is that Memory controllers can use "flex mode" which enables dual channel support (simulates it) with mismatched module sizes.
This is available on most modern Intel chipsets.

also I'm pretty sure that in synthetic bench marks dual vs single channel differences are negligible
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post #5 of 12
Thread Starter 
Quote:
Originally Posted by Jim888 View Post

Are you talking about having 2x4gb and 2x2gb sticks (total of 4 sticks for 12 total gigs?) every mobo manual I've read recently says that it STRONGLY recommends having all 4 the same if your gonna populate all 4 slots. (though intel states that by placing the 4gb sticks in channel 1 slot 0 and channel 2 slot 0 while placing the 8gb sticks in channel 1 slot 1 and channel 2 slot 1 you will keep a dual channel configuration.
or are you asking if you can put 2 different ram sizes in and have it run in dual chan the short answer is NO
the long answer is that Memory controllers can use "flex mode" which enables dual channel support (simulates it) with mismatched module sizes.
This is available on most modern Intel chipsets.
also I'm pretty sure that in synthetic bench marks dual vs single channel differences are negligible


I should have mentioned it's a laptop I'm talking about.
1x4GB and 1x2GB.

The laptop blue screens with 8GB, so that is why I'm not going with 2x4GB (if you were wondering).
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post #6 of 12

You'll get dual-channel assymetric. Dual channel symmetric (identical DIMMs) would be better, but with this you'll get an improvement over single channel (until your RAM usage creeps above 4GB). It's important to note that the OS does not optimize with channels in mind and may use more RAM than is usually necessary, pushing your RAM usage above 4GB when on a 4GB setup it might not actually do that, and then making you deal with the associated performance loss.

 

If this is an APU laptop, you should prefer identical dual channel or you risk bottlenecking the entire system.

post #7 of 12
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post

You'll get dual-channel assymetric. Dual channel symmetric (identical DIMMs) would be better, but with this you'll get an improvement over single channel (until your RAM usage creeps above 4GB). It's important to note that the OS does not optimize with channels in mind and may use more RAM than is usually necessary, pushing your RAM usage above 4GB when on a 4GB setup it might not actually do that, and then making you deal with the associated performance loss.

If this is an APU laptop, you should prefer identical dual channel or you risk bottlenecking the entire system.

Well, I JUST bought 2GB of RAM for the heck of it. It's only around 10 bucks anyway.

When I had 8GB (2x4GB) of RAM on the laptop, games ran many times better than it did with 4GB (1x4GB) and I supposed it was because of the dual channel configuration. However I started experiencing motherboard problems after a while so I had to move back to 4GB, but I was spoiled with 8GB of RAM, so now I'm trying to get the most of the lappy.

I benched DOTA 2 with 4GB, now I'm going to bench it with 6GB and I'll let you guys know the difference.
I can't get around to benching with 8GB, it just keeps crashing. :\
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post #8 of 12
Yes. I was using 2x4gb and 2x2gb untill today when I changed to a 4x4gb of a faster ram today. Worked fine for a year.
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post #9 of 12
Thread Starter 
Well, I managed to get 8GB to work some how...
This is running DOTA 2 for 45 minutes each time on the same replay, benchmarked with FRAPS. Keep in mind this is DDR3 1333 with a AMD A6 3420M and 6520g
All memory sticks have the same timings.

4GB:
Quote:
2012-12-10 18:55:54 - dota
Frames: 60816 - Time: 2700000ms - Avg: 22.524 - Min: 8 - Max: 35

6GB:
Quote:
2012-12-10 17:12:00 - dota
Frames: 74832 - Time: 2700000ms - Avg: 27.716 - Min: 10 - Max: 43

8GB:
Quote:
2012-12-10 19:56:24 - dota
Frames: 76018 - Time: 2700000ms - Avg: 28.155 - Min: 10 - Max: 46

Edited by vinton13 - 12/10/12 at 8:11pm
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post #10 of 12
it depends.

The system might be able to do it. I know my laptop can do 4GB + 2GB in dual channel.

Performance is not ideal in that configuration however. I suspect that what the system does is logically treat the 4GB as two 2GB banks. One of the 2GB banks is used in dual channel alongside the other. The latter bank of memory would be placed at lower priority and would operating in single channel. I could be off though. You should be fine either way though.
Edited by xlink - 12/10/12 at 8:15pm
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